gccint: Plugins tracking

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1 24.9 Keeping track of available passes
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1 When your plugin is loaded, you can inspect the various pass lists to
1 determine what passes are available.  However, other plugins might add
1 new passes.  Also, future changes to GCC might cause generic passes to
1 be added after plugin loading.  When a pass is first added to one of the
1 pass lists, the event 'PLUGIN_NEW_PASS' is invoked, with the callback
1 parameter 'gcc_data' pointing to the new pass.
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